MySQL Bugs: #56523: Instrumentation regression in myisam/mi

Bug #56523	Instrumentation regression in myisam/mi_rprev.c
Submitted:	3 Sep 2010 1:12	Modified:	20 Nov 2010 23:01
Reporter:	Marc ALFF	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: MyISAM storage engine	Severity:	S2 (Serious)
Version:	5.6	OS:	Any
Assigned to:	Marc ALFF	CPU Architecture:	Any

Description:
In myisam/mi_rprev.c, the code was instrumented for the
performance schema, by using the mysql_rwlock_*() apis.

In mysql-next-mr, it seems a backport (Bug#43618: MyISAM&Maria returns wrong results with 'between' on timestamp) caused a regression, and:
- re introduced a use of the old api, rw_unlock(), at line 75
- caused a build warning.

How to repeat:
Read the code, read the build logs, for mysql-next-mr

Suggested fix:
Use mysql_rwlock_unlock().

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/117474

3273 Marc Alff	2010-09-02
      Bug#56523 Instrumentation regression in myisam/mi_rprev.c
      
      Re-instrumented the code for the performance schema.
      
      This fix resolves a build warning caused by a merge problem.

Patch approved.

Pushed into:
- mysql-next-mr-bugfixing

Doc team:
this is a bug that appeared in mysql-next-mr-bugfixing on Aug 16, 2010,
and was fixed in the same place on Sep 7, 2010

This bug never existed in mysql-next-mr.

Pushed into mysql-next-mr (revid:alexander.nozdrin@oracle.com-20101002181053-6iotvl26uurcoryp) (version source revid:alexander.nozdrin@oracle.com-20101002180917-h0n62akupm3z20nt) (pib:21)

Pushed into mysql-trunk 5.6.99-m5 (revid:alexander.nozdrin@oracle.com-20101113155825-czmva9kg4n31anmu) (version source revid:vasil.dimov@oracle.com-20100629074804-359l9m9gniauxr94) (merge vers: 5.6.99-m4) (pib:21)

Bug did not appear in any released version. No changelog entry needed.